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首页> 外文期刊>Review of Scientific Instruments >Absolute measurement of low gas flow by means of the spectral analysis of the thermal wave
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Absolute measurement of low gas flow by means of the spectral analysis of the thermal wave

机译：通过热波频谱分析绝对测量低气流

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摘要

A new technique has been developed for determination of the very low gas flow velocity by means of the spectral analysis of the thermal waves. It is assumed that the transmitter signal is made of sine waves. By employing the Fourier analysis of the detector signals, the phase shifts of the relevant harmonic component of the frequency function were determined. The flow velocity has been obtained by a nonlinear regression analysis of the measured phase shifts values. This method allows for the flow of gas to be measured in a range from 5 to 500 cm/s.
机译：已经开发出一种新技术，用于通过热波的频谱分析确定非常低的气体流速。假设发射机信号由正弦波组成。通过对检测器信号进行傅立叶分析，可以确定频率函数的相关谐波分量的相移。通过对测得的相移值进行非线性回归分析获得了流速。这种方法可以测量5至500 cm / s的气体流量。

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